bootstage: Add SPL support

Allow usage of the bootstage facilities in SPL.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 01dece5..86f53e7 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -178,7 +178,7 @@
 	return 0;
 }
 
-#if CONFIG_IS_ENABLED(BOOTSTAGE)
+#if CONFIG_IS_ENABLED(SHOW_BOOT_PROGRESS)
 void show_boot_progress(int val)
 {
 	outb(val, POST_PORT);